The sudden disappointment of a hope leaves a scar which the ultimate fulfillment of that hope never removes - Thomas Hardy.
Disappointment is the immediate reaction of a lost hope. When you expect too much out of a thing or a relationship and if it doesn't happen the way we expected, the result is a disappointment. Another name for disappointment is frustration. You love a person so much, but he doesn't share the same feeling for you, you feel very irritating.
The more you love a person, the more is your chance of getting hurt. It may be your husband, your daughter or even your friend. I won't say that you should not love them, but love them unconditionally because when you don't expect anything in return, you seldom feel disappointed.